Improvement in devices for operating rock-drills for wells



C. S. SIMMONS, 0. D. SlMMONS & H. H. SIMMONS.

Improvement in Devices for Operating Rock-Drillsfor Wells, &c. No. 129605. Patentedlulyl6,1872.

UNITED STATES PATENT OFFICE.

CHARLES S. SIMMONS, ORLO D. SIMMONS, AND HENRY H. SIMMONS, OF WATERTOWN,NEW YORK.

IMPROVEMENT IN DEVICES FOR OPERATING ROCK-DRILLS FOR WELLS, &c.

Specification forming part of Letters Patent N 0. 129,605, dated July16, 1872.

Specification describing certain Improvements in PowerDrilling-Machines, invented by CHARLES S. SIMMoNs, ORLO D. Sri/nvroNs,and HENRY H. SnuMoNs, of Watertown, county of Jefferson, State of NewYork.

Our invention consists in combining, with the cam-wheel andlifting-lever of a drill, a second cam-wheel and afriction-roller, orits equivalent, bearing with a yielding pressure upon said secondcam-Wheel, the said parts being so arranged with relation to thelifting-lever and its cam-wheel that when the lever drops from the camsof the first wheel the cam or cams of the second wheel will bear againstthe friction device or brake so as to hold the wheels in check andpreserve the uniformity of motion of the machine while the drill isdropping.

Figure l is a perspective view of a machine embodying our invention.Fig. 2 is a plan view of the same. Fig. 3 is a vertical sectional viewon the dotted line A B, Fig. 2.

a is the frame of the machine, consisting of a broad bed-piece furnishedwith two short uprights at the ends, which support a top piece. I) isthe bull-wheel placed on thetop of the frame, which turns with anupright shaft furnished with suitable bearings in the frame, and havingtwo clips arranged at 0ppo'site sides on the top, through which asweep-lever may be passed for the attachment of a horse. a is thepinion-wheel, also fitted to a vertical shaft, and receiving motion fromthe bull-wheel. d is a cam or eccentric wheel on the pinion-shaft,fitted with a number of cams. e is the lifting-lever, made fast at oneend to a projecting part of the frame and working at the other end, bymeans of a small roller, against the cams d. f is a second cam-wheel onthe same shaft with the first, and working against the friction-rollerg. The lifting-lever e is furnished with a number of holes at differentdistances from the fulcrum, into either of which a clevy may befastened, attaching a chain. This chain passes to a leaning mast orderrick, or other contrivance, and, passing under one pulley at thebottom, follows to the top and passes over another, and thence downperpendicularly to the drill. The cam-wheel d is made with such curvesthat with a uniform motion of the wheel a uniform lift is conveyed tothe lever, and, by means of the chain, to the drill. As the wheelrevolves, the end of the cam passes" from under the lever, when thedrill, being unsupported, falls by its own weight, striking a blow onthe rock, and the lifting-lever is brought into a position ready tostart on another lift with the next succeeding cam. The wheels areprevented from leaping forward in intermittent jerks at every droppingof the drill by the second cam-wheel f, which is set upon the shaft withsuch a relation to the first that while the cams d are raising thelifting-lever the friction-roller presents no resistance; but at themoment the lever drops the friction-roller presents itself to thecams f,which, before it can pass, must move back the roller against its springsor weight, and thereby holds the motion in check or keeps it at auniform velocity, allowing the drill to drop and make a full blowwithout being caught up by the next succeeding cam before it can strike.The extent of the lift may be diminished by moving the clevy nearer tothe fulcrum in the series of holes in the lifting-lever for thatpurpose, and increased by moving it further from it; the advantage ofthis over other machines used for the same purpose being that the usualjerking motion, caused by the power being unrestrained when the drillfalls, is entirely obviated by the camwheel f and friction-roller g,-and also the form of the lifting-cam d is such as to insure uni.-formity of motion during the lift.

We make no claim as to the general use of an eccentric with alifting-lever for drilling purposes, for we are awarethat this is not Anew; but

We claim as our invention- The combination, with the lifting-lever andits operating cam-wheel, of a second cam-wheel and a friction device orbrake, bearing with a yielding pressure against the cams of said wheel,said .parts being arranged with relation to the lifting-lever cam-wheeland operating substantially as herein described.

0. S. SIMMONS,

ORLO D. SIMMONS.

HENRY H. SIMMONS.

Witnesses:

J osEPn BASS, AMAZA BASS.

